Magnum Coffee Roasters Magnum Coffee Roastery is family-owned and headed by a true coffee connoisseur. With more than two decades of experience in the coffee industry, Magnum has become the standard upon which all other private label programs are judged. Leave a Reply Cancel replyCommentEnter your name or username to comment Enter your email address to comment Enter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.